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Nguyen Thi Be Dao at a local hospital after poisoning her sons and herself. Photo credit: Nguoi Lao Dong

Police in the southern province of Ba Ria-Vung Tau said Wednesday they have dropped a case against a woman who allegedly injected herbicide into her two sons and killed one, saying she has been diagnosed with mental illness.

Nguyen Thi Be Dao, 26, will be sent to a mental hospital for treatment, Nguoi Lao Dong newspaper reported.

She was put under investigation late last year after her two sons were found poisoned on November 12, 2014.

Police said Dao led her sons, aged 2 and 8, to a rubber forest near her mother’s house and injected Paraquat from a syringe into both of them and herself.

All of them were rushed to hospital soon later. The two boys were then transferred to Ho Chi Minh City Children’s Hospital 1 in critical conditions.

The 2-year-old died on December 3, 2014.

Forensic tests found Paraquat in all of the three.

According to police, Dao took her sons with her to her mother’s house after she had a fight with her husband.

She usually beat up the boys and threatened to kill them and commit suicide.

Doctors at the Ba Ria-Vung Tau Mental Hospital later found that Dao has mental illness and must receive compulsory treatment.